/*
 * Alloy Analyzer
 * Copyright (c) 2002 Massachusetts Institute of Technology
 *
 * The Alloy Analyzer is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * The Alloy Analyzer is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with the Alloy Analyzer; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

package alloy.ast;


/** an AST node representing a predicate */
public class Predicate extends InvocablePara {

    public Predicate(Location location_, QualifiedName name_, FormulaSeq formula_, ArgList argList_) {
        super(location_, name_, formula_, argList_);
    }

    public Predicate(QualifiedName name_, FormulaSeq formula_, ArgList argList_) {
        this(Location.UNKNOWN, name_, formula_, argList_);
    }

    //GET AND SET METHODS

    /**
     * accept an AST visitor
     * @param visitor_ the visitor
     */
    protected void acceptVisitor(ASTVisitor visitor_) {
        visitor_.visit(this);
    }

    /**
     * accept a returning AST visitor
     * @param visitor_ the visitor
     * @return the Object returned by the visitor
     */
    protected Object acceptReturnVisitor(ASTReturnVisitor visitor_) {
        return visitor_.visit(this);
    }

    public String nodeString() {
        StringBuffer ret = new StringBuffer("pred ");
        // check for empty receiver and result decl
        Decl receiverDecl = getArgList().getReceiverDecl();
        if (!(receiverDecl.isEmpty())) {
            ret.append(receiverDecl.getExpr().nodeString() + ".");
        }
        ret.append(getName().nodeString() + " " +
                   "( " +
                   getArgList().getDecls().childrenStr("", ", ", "") + " )");
        ret.append(getFormula().nodeString());
        return ret.toString();
    }

    public String toString()
    {
        return nodeString();
    }
}
















